111×2+12×3+13×4+…+12001×2002=______

111×2+12×3+13×4+…+12001×2002=______.
2025-05-20 23:12:00
推荐回答(1个)
回答1:

1
1
1×2
+
1
2×3
+
1
3×4
+…+
1
2001×2002

=
1
1?
1
2
+
1
2
?
1
3
+
1
3
?
1
4
+…+
1
2001
?
1
2002

=
1
1?
1
2002

=
1
2001
2002

=
2002
2001

=1
1
2001

故答案为:1
1
2001